In the Nachtjagd book on Eastern Front (and MTO) by Theo Boiten, there is no victory for NJG on 1-2 or 2-3 September 1943. The first night 5 Nachjäger were used against at least 56 Soviet bombers, the second again 5 night-fighters against an estimated 51 Soviet bombers, both times in the central part of the front. From the terms used, the number of Soviet bombers is probably coming from German reports rather than Soviet sources.
There is this webpage about a 746 AP pilot called Ishenko, probably your guy, but it has nothing on a loss on 2 September 1943:
https://warheroes.ru/hero/hero.asp?Hero_id=6455